| /* Copyright (C) 1998-2014 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Richard Henderson. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library. If not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <math.h> |
| |
| /* Use the -inf rounding mode conversion instructions to implement |
| ceil, via something akin to -floor(-x). This is much faster than |
| playing with the fpcr to achieve +inf rounding mode. */ |
| |
| float |
| __ceilf (float x) |
| { |
| if (isless (fabsf (x), 16777216.0f)) /* 1 << FLT_MANT_DIG */ |
| { |
| /* Note that Alpha S_Floating is stored in registers in a |
| restricted T_Floating format, so we don't even need to |
| convert back to S_Floating in the end. The initial |
| conversion to T_Floating is needed to handle denormals. */ |
| |
| float tmp1, tmp2, new_x; |
| |
| new_x = -x; |
| __asm ("cvtst/s %3,%2\n\t" |
| #ifdef _IEEE_FP_INEXACT |
| "cvttq/svim %2,%1\n\t" |
| #else |
| "cvttq/svm %2,%1\n\t" |
| #endif |
| "cvtqt/m %1,%0\n\t" |
| : "=f"(new_x), "=&f"(tmp1), "=&f"(tmp2) |
| : "f"(new_x)); |
| |
| /* Fix up the negation we did above, as well as handling -0 properly. */ |
| x = copysignf(new_x, x); |
| } |
| return x; |
| } |
| |
| weak_alias (__ceilf, ceilf) |
